On-vehicle head up display device with optical means for correcting parallax in a vertical direction
US4787711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1986 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Sep 12, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/012
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an on-vehicle head up display device employing a catoptric system for a windshield glass of an automobile to project a display image onto an inner surface of the windshield glass, an optical system for letting a virtual image of the display image of a display means enter the windshield glass is adapted to make an angle formed by light beams of the virtual image entering the windshield glass less than a monocular resolving power. Further, an optical means for correcting parallax of the light beams of the virtual image is provided between the optical system and the windshield glass. Thus, a double image formation and binocular parallax may be eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.